MC68HC908GR4 MOTOROLA [Motorola, Inc], MC68HC908GR4 Datasheet - Page 62

• Manufacturer Part Number: MC68HC908GR4
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Resets and Interrupts
4.3.2 External Reset
4.3.3 Internal Reset
4.3.3.1 Power-On Reset
Technical Data
62
A logic 0 applied to the RST pin for a time, t
reset. An external reset sets the PIN bit in the SIM reset status register.
Sources:
All internal reset sources pull the RST pin low for 32 CGMXCLK cycles
to allow resetting of external devices. The MCU is held in reset for an
additional 32 CGMXCLK cycles after releasing the RST pin.
A power-on reset is an internal reset caused by a positive transition on
the V
This distinguishes between a reset and a POR. The POR is not a brown-
out detector, low-voltage detector, or glitch detector.
CGMXCLK
INTERNAL
RST PIN
Freescale Semiconductor, Inc.
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RESET
For More Information On This Product,
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Power-on reset (POR)
Computer operating properly (COP)
Low-power reset circuits
Illegal opcode
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pin. V
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DD
Resets and Interrupts
at the POR must go completely to 0 V to reset the MCU.
Figure 4-1. Internal Reset Timing
PULLED LOW BY MCU
32 CYCLES
IRL
32 CYCLES
, generates an external
MC68HC908GR8 — Rev 4.0
MOTOROLA